I have a project with grails 3.3.8, the problem is that once I edit a driver or a gsp file, the changes are not reflected in the web browser even though the following message appears when it detects a change :
Controller.groovy change, compiling...
To run the application I only run the run-app command, I do not know if I need to put any parameters or anything like that.
I honestly do not have your solution because I have always developed from the editor atom, sublime and Notepad. I simply have integrated the framework to my Operating System, as well as the jdk and I execute it from cmd, as I have installed xamp occupies the server tomcat of this one.
When that happens to me, I simply stop the execution and I raise it again and with that it is updated. Sinó manages to raise is that errors generated by the latest changes are emitted ... Or by the lack of resources, such as cutting the link to data, although that would be very rare.
It will be necessary to review your log.